Mailboxes displaying GUID instead of Display Name due to change in Microsoft naming convention (4371253)

Mailboxes displaying GUID instead of Display Name due to change in Microsoft naming convention

Microsoft changed the Name parameter associated with recipients within a tenant in Exchange Online, which results in mailboxes displaying mailbox names incorrectly. Instead of displaying the user's Display Name, a GUID is displayed instead.

Here is an example:

Before changes are implemented:
DisplayName: Jeff Smith
Name: Jeff Smith
Alias: jsmith
DistinguishedName: CN= Jeff Smith,OU=(tenant).onmicrosoft.com, OU=Microsoft Exchange Hosted Organizations, DC=NAMP283A001, DC=PROD,DC=OUTLOOK, DC=COM
ExternalDirectoryObjectId: 12313c53-fff7-46d4-8b83-71fb317d1853

After changes are implemented:
DisplayName: Jeff Smith
Name: 12313c53-fff7-46d4-8b83-71fb317d1853
Alias: jsmith
DistinguishedName: CN= 12313c53-fff7-46d4-8b83-71fb317d1853, OU=(tenant).onmicrosoft.com, OU=Microsoft Exchange Hosted Organizations, DC=NAMP283A001, DC=PROD, DC=OUTLOOK, DC=COM 
 

Microsoft change

Upgrade Archive Manager to version 5.9.4

More details can be found in the following article: https://techcommunity.microsoft.com/t5/exchange-team-blog/change-in-naming-convention-of-user-s-name-parameter/ba-p/3284733